===== 15 IS4 F15 ISOLATE STEP 4 | BIOS 19951204 System ROM Version 3.0 11/18/96 A
BadVaddr as the group starts: 00000480
Cache isolation step 4: step 3 (isolated lw, sw 22222222, lw, sw back) from cached code.
It hung the 5501 on 2026-09-26 with nothing after its label (14ISO.txt:8).
4 the same from cached code: cache word before 00000000, read 7FEF0000, memory after 11111111
Done.